InputText: allow callback to update buffer while in read-only mode (f…

…ix for imgui_memory_editor 0.54 in read-only mode).

See ocornut/imgui_club#46

docs/CHANGELOG.txt

@@ -53,6 +53,7 @@ Other changes:
   payload over an already open tree node would incorrectly select it. (#7850)
 - MultiSelect+TreeNode: default open behavior is OpenOnDoubleClick + OpenOnArrow
   when used in a multi-select context without any OpenOnXXX flags set. (#7850)
+- InputText: allow callback to update buffer while in read-only mode. (imgui_club/#46)
 - TextLink(), TextLinkOpenURL(): change mouse cursor to Hand shape when hovered. (#7885, #7660)
 - Fonts: Made it possible to use PushFont()/PopFont() calls accross Begin() calls. (#3224, #3875, #6398, #7903)
 - Backends: GLFW: added ImGui_ImplGlfw_Sleep() helper function because GLFW does not

imgui_widgets.cpp

@@ -4912,7 +4912,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     if (callback_data.SelectionEnd != utf8_selection_end || buf_dirty)      { state->Stb.select_end = (callback_data.SelectionEnd == callback_data.SelectionStart) ? state->Stb.select_start : ImTextCountCharsFromUtf8(callback_data.Buf, callback_data.Buf + callback_data.SelectionEnd); }
                     if (buf_dirty)
                     {
-                        IM_ASSERT(!is_readonly);
+                        // Callback may update buffer and thus set buf_dirty even in read-only mode.
                         IM_ASSERT(callback_data.BufTextLen == (int)strlen(callback_data.Buf)); // You need to maintain BufTextLen if you change the text!
                         InputTextReconcileUndoStateAfterUserCallback(state, callback_data.Buf, callback_data.BufTextLen); // FIXME: Move the rest of this block inside function and rename to InputTextReconcileStateAfterUserCallback() ?
                         if (callback_data.BufTextLen > backup_current_text_length && is_resizable)