Scrollbar() doesn't forcefully mark itself as hovered when held.

Weirdly as old as when dinosaurs roamed earth, aka first commit (per-1.0).
+ Minor alignment in both sense of the term :) Reduce padding in ImGuiNextItemData.

docs/CHANGELOG.txt

@@ -49,7 +49,7 @@ Other changes:
 - Nav: keyboard/gamepad activation mark widgets as held to give better visual feedback.
 - Nav: tweak to logic marking navigated item as hovered when using keyboard, allowing
   the hover highlight to stay even while another item is activated.
-- Fixed SetKeyboardFocusHere() not working when current nav focus is in different scope,
+- Nav: Fixed SetKeyboardFocusHere() not working when current nav focus is in different scope,
   regression from 1.90.1 related to code scoping Tab presses to local scope. (#7226) [@bratpilz]
 - Debug Tools: Metrics: Fixed debug break in SetShortcutRouting() not handling ImGuiMod_Shortcut redirect.
 - Debug Tools: Debug Log: Added "Input Routing" logging.

imgui_internal.h

@@ -1202,10 +1202,10 @@ struct ImGuiNextItemData
     ImGuiNextItemDataFlags      Flags;
     ImGuiItemFlags              ItemFlags;          // Currently only tested/used for ImGuiItemFlags_AllowOverlap.
     // Non-flags members are NOT cleared by ItemAdd() meaning they are still valid during NavProcessItem()
-    float                       Width;              // Set by SetNextItemWidth()
     ImGuiSelectionUserData      SelectionUserData;  // Set by SetNextItemSelectionUserData() (note that NULL/0 is a valid value, we use -1 == ImGuiSelectionUserData_Invalid to mark invalid values)
-    ImGuiCond                   OpenCond;
+    float                       Width;              // Set by SetNextItemWidth()
     bool                        OpenVal;            // Set by SetNextItemOpen()
+    ImGuiCond                   OpenCond : 8;
 
     ImGuiNextItemData()         { memset(this, 0, sizeof(*this)); SelectionUserData = -1; }
     inline void ClearFlags()    { Flags = ImGuiNextItemDataFlags_None; ItemFlags = ImGuiItemFlags_None; } // Also cleared manually by ItemAdd()!

imgui_widgets.cpp

@@ -968,7 +968,6 @@ bool ImGui::ScrollbarEx(const ImRect& bb_frame, ImGuiID id, ImGuiAxis axis, ImS6
 
         // Click position in scrollbar normalized space (0.0f->1.0f)
         const float clicked_v_norm = ImSaturate((mouse_pos_v - scrollbar_pos_v) / scrollbar_size_v);
-        SetHoveredID(id);
 
         bool seek_absolute = false;
         if (g.ActiveIdIsJustActivated)