CLOSES #223, CLOSES #233, CLOSES #236, CLOSES #240, CLOSES #241, CLOSES #249, CLOSES #252, CLOSES #255, CLOSES #257, CLOSES #258, CLOSES #263, CLOSES #265, CLOSES #274, CLOSES #275, CLOSES #276, CLOSES #279, CLOSES #280, CLOSES #282, CLOSES #283, CLOSES #287, CLOSES #291, CLOSES #292, CLOSES #293, CLOSES #301, CLOSES #304, CLOSES #315, CLOSES #316, CLOSES #317, CLOSES #321, CLOSES #322, CLOSES #330

src/import/CacheFs.lua

@@ -75,6 +75,32 @@ local function resolveMkdir()
   return mkdirFn
 end
 
+-- Lazily-resolved windowless rmdir, the mirror of resolveMkdir above:
+-- function(absolutePath) or false when FFI is unavailable.  Both syscalls
+-- refuse a non-empty directory, so a caller has to delete the files first.
+local rmdirFn = nil
+
+local function resolveRmdir()
+  if rmdirFn ~= nil then return rmdirFn end
+  rmdirFn = false
+  local ok, ffi = pcall(require, "ffi")
+  if not ok then return rmdirFn end
+  if ffi.os == "Windows" then
+    pcall(ffi.cdef, "int RemoveDirectoryA(const char *lpPathName);")
+    local resolved = pcall(function() return ffi.C.RemoveDirectoryA end)
+    if resolved then
+      rmdirFn = function(path) pcall(ffi.C.RemoveDirectoryA, path) end
+    end
+  else
+    pcall(ffi.cdef, "int rmdir(const char *pathname);")
+    local resolved = pcall(function() return ffi.C.rmdir end)
+    if resolved then
+      rmdirFn = function(path) pcall(ffi.C.rmdir, path) end
+    end
+  end
+  return rmdirFn
+end
+
 -- Mount an external directory onto the physfs read path (appended, so the
 -- game's own source always wins a name clash).  Returns true on success.
 --
@@ -229,6 +255,23 @@ function CacheFs.remove(rel)
   love.filesystem.remove(rel)
 end
 
+-- Remove a single cache-relative directory once its files are gone.  Needed
+-- because os.remove cannot delete a directory on Windows and
+-- love.filesystem.remove never reaches outside the save directory, so the
+-- portable game folder gets the same FFI-syscall treatment as its mkdir
+-- (issue #74: os.execute would flash a console window per call).  Used by the
+-- mod installer so an uninstall leaves nothing behind (#330).
+function CacheFs.removeDir(rel)
+  rel = withPrefix(rel)
+  local root = CacheFs.root()
+  if root then
+    local rmdir = resolveRmdir()
+    if rmdir then rmdir(realPath(root, rel)) end
+    return
+  end
+  love.filesystem.remove(rel)
+end
+
 -- Remove the game-folder copy of a cache subtree before a fresh import, so a
 -- cache-format bump does not leave orphaned files behind.  No-op when the
 -- portable cache is inactive (the save-directory copy is cleared by

src/import/RomImporter.lua

@@ -255,7 +255,36 @@ local function fileUrl(path)
   return "file://" .. encoded
 end
 
+-- The native pickers below block the whole loop inside io.popen, and they are
+-- opened straight out of mousepressed -- with the button still physically
+-- down.  SDL auto-captures the pointer for the length of a press (on X11 an
+-- XGrabPointer with owner_events) and only drops that capture when it
+-- processes the matching button-up, which it cannot do while we sit in popen
+-- and never pump.  The grab then outlives the click and every pointer event
+-- over the file chooser is still routed to our window: the dialog draws and
+-- keyboard-navigates (keyboard focus is a separate grab) but ignores the
+-- mouse entirely -- issue #254 on Linux.  Whether it bites is a race with how
+-- long the click was held, which is why the same build picks one ROM fine and
+-- then hangs the mouse on the next.  So pump until no button is held, letting
+-- SDL see the release and let go first; bounded, so a stuck button costs a
+-- moment and never the launcher.  pump() only drains OS events into LOVE's
+-- queue -- it dispatches nothing -- so there is no reentry into mousepressed
+-- and the release is still delivered normally on the next frame.
+local function releasePointerGrab()
+  if not (love.mouse and love.mouse.isDown and love.event and love.event.pump
+      and love.timer) then
+    return
+  end
+  local deadline = love.timer.getTime() + 1
+  while love.mouse.isDown(1, 2, 3) do
+    love.event.pump()
+    if love.timer.getTime() > deadline then break end
+    love.timer.sleep(0.005)
+  end
+end
+
 local function commandOutput(command)
+  releasePointerGrab()
   local pipe = io.popen(command, "r")
   if not pipe then return nil end
   local result = pipe:read("*a")
@@ -2476,7 +2505,7 @@ function RomImporter:_drawModsPanel(x, y, w, h)
         love.graphics.printf(m.description, nx, ny + nameH + 6 * s, L.leftW, "left")
       end
 
-      -- right cluster: status chip, toggle, Delete — vertically centred
+      -- right cluster: status chip, toggle, Delete -- vertically centred
       local clusterX = x + w - padH - L.clusterW
       local clusterY = cy + (cardH - clusterH) / 2
       local _, chipColor = modStatusChip(m.status)