Drag and Drop: Fix comment. Removed IMGUI_PAYLOAD_TYPE_DOCKABLE from master branch. (#143)

imgui.h

@@ -655,7 +655,7 @@ enum ImGuiDragDropFlags_
     ImGuiDragDropFlags_AcceptPeekOnly               = ImGuiDragDropFlags_AcceptBeforeDelivery | ImGuiDragDropFlags_AcceptNoDrawDefaultRect  // For peeking ahead and inspecting the payload before delivery.
 };
 
-// Standard Drag and Drop payload types. You can define you own payload types using 8-characters long strings. Types starting with '_' are defined by Dear ImGui.
+// Standard Drag and Drop payload types. You can define you own payload types using 12-characters long strings. Types starting with '_' are defined by Dear ImGui.
 #define IMGUI_PAYLOAD_TYPE_COLOR_3F     "_COL3F"    // float[3]     // Standard type for colors, without alpha. User code may use this type. 
 #define IMGUI_PAYLOAD_TYPE_COLOR_4F     "_COL4F"    // float[4]     // Standard type for colors. User code may use this type.
 

imgui_internal.h

@@ -170,9 +170,6 @@ template <typename T> void IM_DELETE(T*& p) { if (p) { p->~T(); ImGui::MemFree(p
 // Types
 //-----------------------------------------------------------------------------
 
-// Internal Drag and Drop payload types. String starting with '_' are reserved for Dear ImGui.
-#define IMGUI_PAYLOAD_TYPE_DOCKABLE         "_IMDOCK"   // ImGuiWindow* // [Internal] Docking/tabs
-
 enum ImGuiButtonFlags_
 {
     ImGuiButtonFlags_Repeat                 = 1 << 0,   // hold to repeat