[Changed] Stronger workaround for KiCad PCB text cache

Fixes issues with external tools when not using variants
Fixes #652

kibot/globals.py

@@ -373,6 +373,7 @@ def __init__(self):
             """ [auto,yes,no] Remove any cached text variable in the PCB. This is needed in order to force a text
                 variables update when using `set_text_variables`. You might want to disable it when applying some
                 changes to the PCB and create a new copy to send to somebody without changing the cached values.
+                Note that it will save the PCB with the cache erased.
                 The `auto` value will remove the cached values only when using `set_text_variables` """
             self.git_diff_strategy = 'worktree'
             """ [worktree,stash] When computing a PCB/SCH diff it configures how do we preserve the current

kibot/kiplot.py

@@ -208,9 +208,13 @@ def load_board(pcb_file=None, forced=False):
         with hide_stderr():
             board = pcbnew.LoadBoard(pcb_file)
         if GS.global_invalidate_pcb_text_cache == 'yes' and GS.ki6:
+            # Workaround for unexpected KiCad behavior:
+            # https://gitlab.com/kicad/code/kicad/-/issues/14360
             logger.debug('Current PCB text variables cache: {}'.format(board.GetProperties().items()))
             logger.debug('Removing cached text variables')
             board.SetProperties(pcbnew.MAP_STRING_STRING())
+            # Save the PCB, so external tools also gets the reset, i.e. panelize, see #652
+            board.Save(pcb_file)
         if BasePreFlight.get_option('check_zone_fills'):
             GS.fill_zones(board)
         if GS.global_units and GS.ki6: