/bs cpu: add clamp on/off test switch, drop frame CPU line

ClassicAPI's frame CPU numbers exceeded wall-clock time, so they are no
longer shown. `/bs cpu clamp on|off` toggles SetClampedToScreen on the
inventory windows for the session to test the engine-side drag stalls.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019W3rwt5PZSpEDkXYzRuRhH

Changelog.md

@@ -4,7 +4,7 @@
 
 ### Added
 
-- `/bs cpu` (hidden command): with ClassicAPI and `/console scriptProfile 1`, shows where CPU time went since the last reset: the busiest addons, Bagshui's windows, and Bagshui's busiest functions. `/bs cpu reset` starts a new measurement.
+- `/bs cpu` (hidden command): with ClassicAPI and `/console scriptProfile 1`, shows where CPU time went since the last reset: the busiest addons and Bagshui's busiest functions. `/bs cpu reset` starts a new measurement, and `/bs cpu clamp on|off` switches the windows' keep-on-screen clamp until /reload (for testing drag freezes).
 
 ## 1.6.5 - 2026-10-31
 

Components/CpuProfile.lua

@@ -2,8 +2,10 @@
 -- Exposes: Bagshui.components.CpuProfile
 --
 -- `/bs cpu` reads ClassicAPI's script profiler and prints where CPU time went since the last
--- reset (or /reload): the busiest addons, Bagshui's busiest frames, and Bagshui's busiest
--- functions. `/bs cpu reset` starts a new measurement.
+-- reset (or /reload): the busiest addons and Bagshui's busiest functions.
+-- `/bs cpu reset` starts a new measurement.
+-- `/bs cpu clamp on|off` switches the windows' keep-on-screen clamp for this session only,
+-- to test whether it causes the engine-side stalls while dragging.
 --
 -- Needs ClassicAPI and the scriptProfile CVar (`/console scriptProfile 1`, then /reload).
 -- Profiling slows every addon down a little, so turn it off again when done.
@@ -13,7 +15,6 @@ Bagshui:AddComponent(function()
   Bagshui.components.CpuProfile = CpuProfile
 
   local TOP_ADDONS = 5
-  local TOP_FRAMES = 4
   local TOP_FUNCTIONS = 8
 
   --- Print one line to chat with a consistent prefix.
@@ -60,31 +61,6 @@ Bagshui:AddComponent(function()
     return list
   end
 
-  --- CPU time of Bagshui's own frames (scripts on the frame and its children).
-  ---@return table list { name, ms }
-  local function FrameUsage()
-    local list = {}
-    if type(_G.GetFrameCPUUsage) ~= "function" then
-      return list
-    end
-    local function Add(name, frame)
-      if frame then
-        local ok, ms = pcall(_G.GetFrameCPUUsage, frame, true)
-        if ok and type(ms) == "number" and ms > 0 then
-          table.insert(list, { name = name, ms = ms })
-        end
-      end
-    end
-    Add("Event frame", Bagshui.eventFrame)
-    for name, component in pairs(Bagshui.components) do
-      if type(component) == "table" and type(component.uiFrame) == "table" then
-        Add(name .. " window", component.uiFrame)
-      end
-    end
-    table.sort(list, ByMs)
-    return list
-  end
-
   --- CPU time of every function reachable from Bagshui's tables.
   --- `total` includes the functions it calls; `self` is time spent in the function itself.
   ---@return table byTotal, table bySelf  Lists of { name, ms }.
@@ -150,7 +126,6 @@ Bagshui:AddComponent(function()
     Out("CPU time since " .. since .. " (/bs cpu reset to start over)")
 
     PrintTop("Addons", AddOnUsage(), TOP_ADDONS)
-    PrintTop("Bagshui frames", FrameUsage(), TOP_FRAMES)
     local byTotal, bySelf = FunctionUsage()
     PrintTop("Bagshui functions, own time", bySelf, TOP_FUNCTIONS)
     PrintTop("Bagshui functions, including calls", byTotal, TOP_FUNCTIONS)
@@ -167,9 +142,35 @@ Bagshui:AddComponent(function()
     Out("counters reset. Reproduce the hitch, then type /bs cpu.")
   end
 
+  --- Switch the keep-on-screen clamp on all inventory windows (not saved; /reload restores it).
+  ---@param enable boolean
+  function CpuProfile:SetClamp(enable)
+    local count = 0
+    for _, component in pairs(Bagshui.components) do
+      if
+        type(component) == "table"
+        and component.inventoryType
+        and type(component.uiFrame) == "table"
+        and component.uiFrame.SetClampedToScreen
+      then
+        component.uiFrame:SetClampedToScreen(enable)
+        count = count + 1
+      end
+    end
+    Out(string.format("keep-on-screen clamp %s for %d windows until /reload.", enable and "ON" or "OFF", count))
+  end
+
   BsSlash:AddHandler("CPU", function(tokens)
-    if tokens[2] and string.lower(tokens[2]) == "reset" then
+    local verb = tokens[2] and string.lower(tokens[2])
+    if verb == "reset" then
       CpuProfile:Reset()
+    elseif verb == "clamp" then
+      local state = tokens[3] and string.lower(tokens[3])
+      if state == "on" or state == "off" then
+        CpuProfile:SetClamp(state == "on")
+      else
+        Out("usage: /bs cpu clamp on|off")
+      end
     else
       CpuProfile:Report()
     end