Internals: added ImDrawTextFlags_WrapKeepTrailingBlanks required for text-edit style word-wrapping.

(for #3237, #952, #1062, #7363)

imgui_draw.cpp

@@ -5352,8 +5352,7 @@ const char* ImTextCalcWordWrapNextLineStart(const char* text, const char* text_e
 // Simple word-wrapping for English, not full-featured. Please submit failing cases!
 // This will return the next location to wrap from. If no wrapping if necessary, this will fast-forward to e.g. text_end.
 // FIXME: Much possible improvements (don't cut things like "word !", "word!!!" but cut within "word,,,,", more sensible support for punctuations, support for Unicode punctuations, etc.)
-const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width)
-//, ImDrawTextFlags flags)
+const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width, ImDrawTextFlags flags)
 {
     // For references, possible wrap point marked with ^
     //  "aaa bbb, ccc,ddd. eee   fff. ggg!"
@@ -5428,6 +5427,8 @@ const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* t
             {
                 prev_word_end = word_end;
                 line_width += word_width + blank_width;
+                if ((flags & ImDrawTextFlags_WrapKeepBlanks) && line_width <= wrap_width)
+                    prev_word_end = s;
                 word_width = blank_width = 0.0f;
             }
 
@@ -5456,7 +5457,7 @@ const char* ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* t
 
 const char* ImFont::CalcWordWrapPosition(float size, const char* text, const char* text_end, float wrap_width)
 {
-    return ImFontCalcWordWrapPositionEx(this, size, text, text_end, wrap_width);
+    return ImFontCalcWordWrapPositionEx(this, size, text, text_end, wrap_width, ImDrawTextFlags_None);
 }
 
 ImVec2 ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining)

imgui_internal.h

@@ -193,6 +193,7 @@ enum ImGuiLocKey : int;                 // -> enum ImGuiLocKey              // E
 typedef int ImGuiLayoutType;            // -> enum ImGuiLayoutType_         // Enum: Horizontal or vertical
 
 // Flags
+typedef int ImDrawTextFlags;            // -> enum ImDrawTextFlags_         // Flags: for ImTextCalcWordWrapPositionEx()
 typedef int ImGuiActivateFlags;         // -> enum ImGuiActivateFlags_      // Flags: for navigation/focus function (will be for ActivateItem() later)
 typedef int ImGuiDebugLogFlags;         // -> enum ImGuiDebugLogFlags_      // Flags: for ShowDebugLogWindow(), g.DebugLogFlags
 typedef int ImGuiFocusRequestFlags;     // -> enum ImGuiFocusRequestFlags_  // Flags: for FocusWindow()
@@ -430,8 +431,13 @@ IMGUI_API const char*   ImTextFindPreviousUtf8Codepoint(const char* in_text_star
 IMGUI_API int           ImTextCountLines(const char* in_text, const char* in_text_end);                                         // return number of lines taken by text. trailing carriage return doesn't count as an extra line.
 
 // Helpers: High-level text functions (DO NOT USE!!! THIS IS A MINIMAL SUBSET OF LARGER UPCOMING CHANGES)
+enum ImDrawTextFlags_
+{
+    ImDrawTextFlags_None                = 0,
+    ImDrawTextFlags_WrapKeepBlanks      = 1 << 1,
+};
 IMGUI_API ImVec2        ImFontCalcTextSizeEx(ImFont* font, float size, float max_width, float wrap_width, const char* text_begin, const char* text_end, const char** out_remaining);
-IMGUI_API const char*   ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width);
+IMGUI_API const char*   ImFontCalcWordWrapPositionEx(ImFont* font, float size, const char* text, const char* text_end, float wrap_width, ImDrawTextFlags flags = 0);
 IMGUI_API const char*   ImTextCalcWordWrapNextLineStart(const char* text, const char* text_end);                                // trim trailing space and find beginning of next line
 
 // Helpers: File System