InputText: added mGuiInputTextCallbackData::EventActive helpers. (#9174)

diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index afa1d55..4324c69 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt

@@ -155,9 +155,9 @@
     next to each components, in multi-components functions.
   - Added a way to select a specific marker color.
 - InputText:
-  - Made ImGuiInputTextCallbackData::SelectAll() also sets CursorPos to SelectionEnd.
-  - Added ImGuiInputTextCallbackData::SetSelection() helper.
-  - Added ImGuiInputTextCallbackData::ID field.
+  - ImGuiInputTextCallbackData: SelectAll() also sets CursorPos to SelectionEnd.
+  - ImGuiInputTextCallbackData: Added SetSelection() helper.
+  - ImGuiInputTextCallbackData: Added ID and EventActive helpers. (#9174)
 - Text, InputText:
   - Reworked word-wrapping logic:
     - Try to not wrap in the middle of contiguous punctuations. (#8139, #8439, #9094)

diff --git a/imgui.h b/imgui.h
index 01e5113..4a9af9b 100644
--- a/imgui.h
+++ b/imgui.h

@@ -2638,6 +2638,7 @@
     // - If you know your edits are not going to resize the underlying buffer allocation, you may modify the contents of 'Buf[]' directly. You need to update 'BufTextLen' accordingly (0 <= BufTextLen < BufSize) and set 'BufDirty'' to true so InputText can update its internal state.
     ImGuiKey            EventKey;       // Key pressed (Up/Down/TAB)            // Read-only    // [Completion,History]
     ImWchar             EventChar;      // Character input                      // Read-write   // [CharFilter] Replace character with another one, or set to zero to drop. return 1 is equivalent to setting EventChar=0;
+    bool                EventActivated; // Input field just got activated       // Read-only    // [Always]
     bool                BufDirty;       // Set if you modify Buf/BufTextLen!    // Write        // [Completion,History,Always]
     char*               Buf;            // Text buffer                          // Read-write   // [Resize] Can replace pointer / [Completion,History,Always] Only write to pointed data, don't replace the actual pointer!
     int                 BufTextLen;     // Text length (in bytes)               // Read-write   // [Resize,Completion,History,Always] Exclude zero-terminator storage. In C land: == strlen(some_text), in C++ land: string.length()

diff --git a/imgui_widgets.cpp b/imgui_widgets.cpp
index 17e69c3..8faf35e 100644
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp

@@ -4506,6 +4506,7 @@
         callback_data.Flags = flags;
         callback_data.EventFlag = ImGuiInputTextFlags_CallbackCharFilter;
         callback_data.EventChar = (ImWchar)c;
+        callback_data.EventActivated = (g.ActiveId == state->ID && g.ActiveIdIsJustActivated);
         callback_data.UserData = user_data;
         if (callback(&callback_data) != 0)
             return false;
@@ -5302,6 +5303,7 @@
                     callback_data.ID = id;
                     callback_data.Flags = flags;
                     callback_data.EventFlag = event_flag;
+                    callback_data.EventActivated = (g.ActiveId == state->ID && g.ActiveIdIsJustActivated);
                     callback_data.UserData = callback_user_data;
 
                     // FIXME-OPT: Undo stack reconcile needs a backup of the data until we rework API, see #7925
@@ -5380,6 +5382,7 @@
             callback_data.ID = id;
             callback_data.Flags = flags;
             callback_data.EventFlag = ImGuiInputTextFlags_CallbackResize;
+            callback_data.EventActivated = (g.ActiveId == state->ID && g.ActiveIdIsJustActivated);
             callback_data.Buf = buf;
             callback_data.BufTextLen = apply_new_text_length;
             callback_data.BufSize = ImMax(buf_size, apply_new_text_length + 1);