Added new Option: Enable scrolling beyond last line

Closes #2034

This option configures the vertical scroll range of Scintilla.
Disable this will configure the scroll range to end at last line
(DEFAULT).
Enable this will configure the scroll range to end one page beyond the
last line.

PowerEditor/src/Notepad_plus.cpp

@@ -274,6 +274,9 @@ LRESULT Notepad_plus::init(HWND hwnd)
 	_mainEditView.execute(SCI_SETCARETLINEVISIBLE, svp1._currentLineHilitingShow);
 	_subEditView.execute(SCI_SETCARETLINEVISIBLE, svp1._currentLineHilitingShow);
 
+	_mainEditView.execute(SCI_SETENDATLASTLINE, not svp1._scrollBeyondLastLine);
+	_subEditView.execute(SCI_SETENDATLASTLINE, not svp1._scrollBeyondLastLine);
+
 	if (svp1._doSmoothFont)
 	{
 		_mainEditView.execute(SCI_SETFONTQUALITY, SC_EFF_QUALITY_LCD_OPTIMIZED);

PowerEditor/src/NppCommands.cpp

@@ -2801,6 +2801,14 @@ void Notepad_plus::command(int id)
 		}
 		break;
 
+		case IDM_VIEW_SCROLL_BEYOND_LASTLINE:
+		{
+			const bool endAtLastLine = not NppParameters::getInstance()->getSVP()._scrollBeyondLastLine;
+			_mainEditView.execute(SCI_SETENDATLASTLINE, endAtLastLine);
+			_subEditView.execute(SCI_SETENDATLASTLINE, endAtLastLine);
+		}
+		break;
+
 		case IDM_VIEW_EDGEBACKGROUND:
 		case IDM_VIEW_EDGELINE:
 		case IDM_VIEW_EDGENONE:

PowerEditor/src/Parameters.cpp

@@ -4752,6 +4752,16 @@ void NppParameters::feedScintillaParam(TiXmlNode *node)
 			_svp._currentLineHilitingShow = false;
 	}
 
+	// Scrolling Beyond Last Line State
+	nm = element->Attribute(TEXT("scrollBeyondLastLine"));
+	if (nm)
+	{
+		if (!lstrcmp(nm, TEXT("yes")))
+			_svp._scrollBeyondLastLine = true;
+		else if (!lstrcmp(nm, TEXT("no")))
+			_svp._scrollBeyondLastLine = false;
+	}
+
 	// Disable Advanced Scrolling
 	nm = element->Attribute(TEXT("disableAdvancedScrolling"));
 	if (nm)
@@ -4975,6 +4985,7 @@ bool NppParameters::writeScintillaParams(const ScintillaViewParams & svp)
 	(scintNode->ToElement())->SetAttribute(TEXT("lineWrapMethod"), pWrapMethodStr);
 
 	(scintNode->ToElement())->SetAttribute(TEXT("currentLineHilitingShow"), svp._currentLineHilitingShow?TEXT("show"):TEXT("hide"));
+	(scintNode->ToElement())->SetAttribute(TEXT("scrollBeyondLastLine"), svp._scrollBeyondLastLine?TEXT("yes"):TEXT("no"));
 	(scintNode->ToElement())->SetAttribute(TEXT("disableAdvancedScrolling"), svp._disableAdvancedScrolling?TEXT("yes"):TEXT("no"));
 	(scintNode->ToElement())->SetAttribute(TEXT("wrapSymbolShow"), svp._wrapSymbolShow?TEXT("show"):TEXT("hide"));
 	(scintNode->ToElement())->SetAttribute(TEXT("Wrap"), svp._doWrap?TEXT("yes"):TEXT("no"));

PowerEditor/src/Parameters.h

@@ -837,6 +837,7 @@ struct ScintillaViewParams
 	bool _whiteSpaceShow = false;
 	bool _eolShow;
 	int _borderWidth = 2;
+	bool _scrollBeyondLastLine = false;
 	bool _disableAdvancedScrolling = false;
 	bool _doSmoothFont = false;
 	bool _showBorderEdge = true;

PowerEditor/src/WinControls/Preference/preference.rc

@@ -114,7 +114,8 @@ BEGIN
     CONTROL         "Display bookmark",IDC_CHECK_BOOKMARKMARGE,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,298,120,150,10
     CONTROL         "Enable current line highlighting",IDC_CHECK_CURRENTLINEHILITE,  "Button",BS_AUTOCHECKBOX | WS_TABSTOP,298,133,129,10
     CONTROL         "Enable smooth font",IDC_CHECK_SMOOTHFONT,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,298,146,129,10
-    CONTROL         "Disable advanced scrolling feature\r(if you have touchpad problem)",IDC_CHECK_DISABLEADVANCEDSCROLL, "Button",BS_AUTOCHECKBOX | BS_MULTILINE | WS_TABSTOP,298,159,139,18
+    CONTROL         "Enable scrolling beyond last line",IDC_CHECK_SCROLLBEYONDLASTLINE, "Button",BS_AUTOCHECKBOX | WS_TABSTOP,298,159,139,10
+    CONTROL         "Disable advanced scrolling feature\r(if you have touchpad problem)",IDC_CHECK_DISABLEADVANCEDSCROLL, "Button",BS_AUTOCHECKBOX | BS_MULTILINE | WS_TABSTOP,298,172,139,18
 END
 
 IDD_PREFERENCE_SETTING_BOX DIALOGEX 0, 0, 455, 185

PowerEditor/src/WinControls/Preference/preferenceDlg.cpp

@@ -573,6 +573,7 @@ void MarginsDlg::initScintParam()
 	::SendDlgItemMessage(_hSelf, IDC_CHECK_LINENUMBERMARGE, BM_SETCHECK, svp._lineNumberMarginShow, 0);
 	::SendDlgItemMessage(_hSelf, IDC_CHECK_BOOKMARKMARGE, BM_SETCHECK, svp._bookMarkMarginShow, 0);
 	::SendDlgItemMessage(_hSelf, IDC_CHECK_CURRENTLINEHILITE, BM_SETCHECK, svp._currentLineHilitingShow, 0);
+	::SendDlgItemMessage(_hSelf, IDC_CHECK_SCROLLBEYONDLASTLINE, BM_SETCHECK, svp._scrollBeyondLastLine, 0);
 	::SendDlgItemMessage(_hSelf, IDC_CHECK_DISABLEADVANCEDSCROLL, BM_SETCHECK, svp._disableAdvancedScrolling, 0);
 
 	::SendDlgItemMessage(_hSelf, IDC_CHECK_NOEDGE, BM_SETCHECK, !svp._showBorderEdge, 0);
@@ -681,6 +682,11 @@ INT_PTR CALLBACK MarginsDlg::run_dlgProc(UINT Message, WPARAM wParam, LPARAM lPa
 					::SendMessage(_hParent, WM_COMMAND, IDM_VIEW_CURLINE_HILITING, 0);
 					return TRUE;
 
+				case IDC_CHECK_SCROLLBEYONDLASTLINE:
+					svp._scrollBeyondLastLine = (BST_CHECKED == ::SendDlgItemMessage(_hSelf, IDC_CHECK_SCROLLBEYONDLASTLINE, BM_GETCHECK, 0, 0));
+					::SendMessage(_hParent, WM_COMMAND, IDM_VIEW_SCROLL_BEYOND_LASTLINE, 0);
+					return TRUE;
+
 				case IDC_CHECK_DISABLEADVANCEDSCROLL:
 					svp._disableAdvancedScrolling = (BST_CHECKED == ::SendDlgItemMessage(_hSelf, IDC_CHECK_DISABLEADVANCEDSCROLL, BM_GETCHECK, 0, 0));
 					return TRUE;

PowerEditor/src/WinControls/Preference/preference_rc.h

@@ -113,6 +113,7 @@
 	#define	IDC_BORDERWIDTH_SLIDER (IDD_PREFERENCE_MARGEIN_BOX + 33)
 	#define	IDC_CHECK_DISABLEADVANCEDSCROLL (IDD_PREFERENCE_MARGEIN_BOX + 34)
 	#define	IDC_CHECK_NOEDGE (IDD_PREFERENCE_MARGEIN_BOX + 35)
+	#define	IDC_CHECK_SCROLLBEYONDLASTLINE (IDD_PREFERENCE_MARGEIN_BOX + 36)
 	
 #define	IDD_PREFERENCE_DELIMITERSETTINGS_BOX 6250 //(IDD_PREFERENCE_BOX + 250)
 	#define	IDC_DELIMITERSETTINGS_GB_STATIC (IDD_PREFERENCE_DELIMITERSETTINGS_BOX + 1)

PowerEditor/src/menuCmdID.h

@@ -343,6 +343,8 @@
 	#define	   IDM_VIEW_TAB_MOVEFORWARD			  (IDM_VIEW + 98)
 	#define	   IDM_VIEW_TAB_MOVEBACKWARD		  (IDM_VIEW + 99)
 
+	#define	   IDM_VIEW_SCROLL_BEYOND_LASTLINE	  (IDM_VIEW + 100)
+
     #define    IDM_VIEW_GOTO_ANOTHER_VIEW        10001
     #define    IDM_VIEW_CLONE_TO_ANOTHER_VIEW    10002
     #define    IDM_VIEW_GOTO_NEW_INSTANCE        10003