minor optimization to the message widget

src/u_ceproject.pas

@@ -943,8 +943,10 @@ begin
       (sender as TDexedProcess).getFullLines(lst)
     else
       processOutputToStrings(TProcess(sender), lst);
+    fMsgs.beginMessageCall();
     for str in lst do
       fMsgs.message(str, fAsProjectItf, amcProj, amkBub);
+    fMsgs.endMessageCall();
   finally
     lst.Free;
   end;
@@ -974,8 +976,10 @@ begin
   lst := TStringList.Create;
   try
     fCompilProc.getFullLines(lst);
+    fMsgs.beginMessageCall();
     for str in lst do
       fMsgs.message(str, fAsProjectItf, amcProj, amkAuto);
+    fMsgs.endMessageCall();
   finally
     lst.Free;
   end;

src/u_dubproject.pas

@@ -1066,8 +1066,10 @@ begin
   lst := TStringList.Create;
   try
     fDubProc.getFullLines(lst);
+    fMsgs.beginMessageCall();
     for str in lst do
       fMsgs.message(str, fAsProjectItf, amcProj, amkAuto);
+    fMsgs.endMessageCall();
   finally
     lst.Free;
   end;

src/u_interfaces.pas

@@ -271,6 +271,10 @@ type
    * Single service provided by the messages widget.
    *)
   IMessagesDisplay = interface(ISingleService)
+    // begins several calls to message()
+    procedure beginMessageCall();
+    // ends several calls to message()
+    procedure endMessageCall();
     // displays a message.
     procedure message(const value: string; aData: Pointer; aCtxt: TAppMessageCtxt; aKind: TAppMessageKind);
     // clears the messages related to the context aCtxt.

src/u_main.pas

@@ -2931,12 +2931,14 @@ begin
   lst := TStringList.Create;
   try
     proc.getFullLines(lst);
+    fMsgs.beginMessageCall();
     if proc = fRunProc then
       for str in lst do
         fMsgs.message(str, fDoc, amcEdit, amkBub)
     else // dmd used to compile runnable
       for str in lst do
         fMsgs.message(str, fDoc, amcEdit, amkAuto);
+    fMsgs.endMessageCall();
   finally
     lst.Free;
   end;

src/u_messages.pas

@@ -164,6 +164,8 @@ type
     //
     function singleServiceName: string;
     procedure message(const value: string; aData: Pointer; aCtxt: TAppMessageCtxt; aKind: TAppMessageKind);
+    procedure beginMessageCall();
+    procedure endMessageCall();
     procedure clearbyContext(aCtxt: TAppMessageCtxt);
     procedure clearbyData(data: Pointer);
     procedure scrollToBack;
@@ -942,6 +944,16 @@ begin
   exit('IMessagesDisplay');
 end;
 
+procedure TMessagesWidget.beginMessageCall();
+begin
+  list.BeginUpdate;
+end;
+
+procedure TMessagesWidget.endMessageCall();
+begin
+  list.EndUpdate;
+end;
+
 procedure TMessagesWidget.message(const value: string; aData: Pointer;
   aCtxt: TAppMessageCtxt; aKind: TAppMessageKind);
 var
@@ -952,7 +964,7 @@ begin
   showWidget;
   if not fAlwaysFilter then
     TreeFilterEdit1.Filter:='';
-  if (value.length > fOptions.maxLineLength) and (fOptions.maxLineLength > 0) then
+  if (fOptions.maxLineLength > 0) and (value.length > fOptions.maxLineLength) then
     msg := value[1..fOptions.maxLineLength]
   else
     msg := value;

src/u_tools.pas

@@ -279,8 +279,10 @@ begin
     lst := TStringList.Create;
     try
       fProcess.getFullLines(lst);
+      fMsgs.beginMessageCall();
       for str in lst do
         fMsgs.message(str, nil, amcMisc, amkAuto);
+      fMsgs.endMessageCall();
     finally
       lst.Free;
     end;