Tidying up default clipboard handler for non Windows-OS

imgui.cpp

@@ -2833,11 +2833,7 @@ void ImGui::Shutdown()
         g.RenderDrawLists[i].clear();
     g.OverlayDrawList.ClearFreeMemory();
     g.ColorEditModeStorage.Clear();
-    if (g.PrivateClipboard)
-    {
-        ImGui::MemFree(g.PrivateClipboard);
-        g.PrivateClipboard = NULL;
-    }
+    g.PrivateClipboard.clear();
     g.InputTextState.Text.clear();
     g.InputTextState.InitialText.clear();
     g.InputTextState.TempTextBuffer.clear();
@@ -10336,21 +10332,18 @@ static void SetClipboardTextFn_DefaultImpl(const char* text)
 // Local ImGui-only clipboard implementation, if user hasn't defined better clipboard handlers
 static const char* GetClipboardTextFn_DefaultImpl()
 {
-    return GImGui->PrivateClipboard;
+    ImGuiContext& g = *GImGui;
+    return g.PrivateClipboard.empty() ? NULL : g.PrivateClipboard.begin();
 }
 
 // Local ImGui-only clipboard implementation, if user hasn't defined better clipboard handlers
 static void SetClipboardTextFn_DefaultImpl(const char* text)
 {
     ImGuiContext& g = *GImGui;
-    if (g.PrivateClipboard)
-    {
-        ImGui::MemFree(g.PrivateClipboard);
-        g.PrivateClipboard = NULL;
-    }
+    g.PrivateClipboard.clear();
     const char* text_end = text + strlen(text);
-    g.PrivateClipboard = (char*)ImGui::MemAlloc((size_t)(text_end - text) + 1);
-    memcpy(g.PrivateClipboard, text, (size_t)(text_end - text));
+    g.PrivateClipboard.resize((size_t)(text_end - text) + 1);
+    memcpy(&g.PrivateClipboard[0], text, (size_t)(text_end - text));
     g.PrivateClipboard[(int)(text_end - text)] = 0;
 }
 

imgui_internal.h

@@ -467,7 +467,7 @@ struct ImGuiContext
     float                   DragSpeedScaleFast;
     ImVec2                  ScrollbarClickDeltaToGrabCenter;    // Distance between mouse and center of grab box, normalized in parent space. Use storage?
     char                    Tooltip[1024];
-    char*                   PrivateClipboard;                   // If no custom clipboard handler is defined
+    ImVector<char>          PrivateClipboard;                   // If no custom clipboard handler is defined
     ImVec2                  OsImePosRequest, OsImePosSet;       // Cursor position request & last passed to the OS Input Method Editor
 
     // Logging
@@ -554,7 +554,6 @@ struct ImGuiContext
         DragSpeedScaleFast = 10.0f;
         ScrollbarClickDeltaToGrabCenter = ImVec2(0.0f, 0.0f);
         memset(Tooltip, 0, sizeof(Tooltip));
-        PrivateClipboard = NULL;
         OsImePosRequest = OsImePosSet = ImVec2(-1.0f, -1.0f);
 
         ModalWindowDarkeningRatio = 0.0f;