SynEdit: fixed SynPopUpMenu, enable/disable select all / Added SynEdit.HasText to check if non-empty

components/synedit/synedit.pp

@@ -207,6 +207,11 @@ type
   );
   TSynEditTextFlags = set of TSynEditTextFlag;
 
+  TSynEditHasTextFlag = (
+    shtIncludeVirtual // trailing spaces
+  );
+  TSynEditHasTextFlags = set of TSynEditHasTextFlag;
+
   TSynStateFlag = (sfCaretChanged, sfHideCursor,
     sfEnsureCursorPos, sfEnsureCursorPosAtResize, sfEnsureCursorPosForEditRight, sfEnsureCursorPosForEditLeft,
     sfExplicitTopLine, sfExplicitLeftChar,  // when doing EnsureCursorPos keep top/Left, if they where set explicitly after the caret (only applies before handle creation)
@@ -946,6 +951,7 @@ type
     // Text Raw (not undo-able)
     procedure Clear;
     procedure Append(const Value: String);
+    function HasText(AFlags: TSynEditHasTextFlags = []): Boolean;
     property LineText: string read GetLineText write SetLineText;               // textline at CaretY
     property Text: string read SynGetText write SynSetText;                     // No uncommited (trailing/trimmable) spaces
 
@@ -4730,6 +4736,16 @@ begin
   FTheLinesView.Append(Value);
 end;
 
+function TCustomSynEdit.HasText(AFlags: TSynEditHasTextFlags): Boolean;
+begin
+  if shtIncludeVirtual in AFlags then
+    Result := (FTheLinesView.Count > 1) or
+              ( (FTheLinesView.Count = 1) and ((FTheLinesView[0] <> '')) )
+  else
+    Result := (FLines.Count > 1) or
+              ( (FLines.Count = 1) and ((FLines[0] <> '')) );
+end;
+
 procedure TCustomSynEdit.DoBlockSelectionChanged(Sender : TObject);
 begin
   StatusChanged([scSelection]);

components/synedit/synpopupmenu.pas

@@ -121,7 +121,7 @@ begin
             meCopy:      Items[i].Enabled := SelAvail;
             mePaste:     Items[i].Enabled := CanPaste;
             meDelete:    Items[i].Enabled := SelAvail and not ReadOnly;
-            meSelectAll: Items[i].Enabled := (Lines.Count > 1) or (Lines.Text <> '');
+            meSelectAll: Items[i].Enabled := HasText([shtIncludeVirtual]);
           end;
   end;
   inherited;