Dark mode tweaks and unicode size support for InSelection configurable size

Followup PR to #14175

Addresses

* https://github.com/notepad-plus-plus/notepad-plus-plus/pull/14175#issuecomment-1751439227

and

* 591b00e538 (commitcomment-129354863)

Close #14217

PowerEditor/src/ScintillaComponent/FindReplaceDlg.cpp

@@ -1493,7 +1493,7 @@ intptr_t CALLBACK FindReplaceDlg::run_dlgProc(UINT message, WPARAM wParam, LPARA
 			if (LOWORD(wParam) == WA_ACTIVE || LOWORD(wParam) == WA_CLICKACTIVE)
 			{
 				Sci_CharacterRangeFull cr = (*_ppEditView)->getSelection();
-				intptr_t nbSelected = cr.cpMax - cr.cpMin;
+				intptr_t nbSelected = (*_ppEditView)->execute(SCI_COUNTCHARACTERS, cr.cpMin, cr.cpMax);
 
 				bool inSelEnabled = nbSelected != 0;
 

PowerEditor/src/WinControls/Preference/preferenceDlg.cpp

@@ -247,6 +247,8 @@ intptr_t CALLBACK PreferenceDlg::run_dlgProc(UINT message, WPARAM wParam, LPARAM
 				NppDarkMode::setDarkTooltips(_delimiterSubDlg._tip, NppDarkMode::ToolTipsType::tooltip);
 			if (_performanceSubDlg._largeFileRestrictionTip != nullptr)
 				NppDarkMode::setDarkTooltips(_performanceSubDlg._largeFileRestrictionTip, NppDarkMode::ToolTipsType::tooltip);
+			if (_searchingSubDlg._tipInSelThresh != nullptr)
+				NppDarkMode::setDarkTooltips(_searchingSubDlg._tipInSelThresh, NppDarkMode::ToolTipsType::tooltip);
 
 			// groupbox label in dark mode support disabled text color
 			if (NppDarkMode::isEnabled())
@@ -5595,6 +5597,7 @@ intptr_t CALLBACK SearchingSubDlg::run_dlgProc(UINT message, WPARAM wParam, LPAR
 
 		case WM_CTLCOLORDLG:
 		case WM_CTLCOLORSTATIC:
+		case WM_CTLCOLOREDIT:
 		{
 			return NppDarkMode::onCtlColorDarker(reinterpret_cast<HDC>(wParam));
 		}

PowerEditor/src/WinControls/Preference/preferenceDlg.h

@@ -176,6 +176,7 @@ private :
 
 class SearchingSubDlg : public StaticDialog
 {
+friend class PreferenceDlg;
 public:
 	SearchingSubDlg() = default;
 	~SearchingSubDlg() {