What Interrupts Chain Fishing? [duplicate]

I am currently farming Heart Scales from Luvdiscs. Looking at the fact I am not moving, but just fishing then thieving with Malamar, I was wondering if I could possibly get a Shiny out of it. What will interrupt my "Chain Fishing"? Does going to my inventory to take the heart scale cancel it? What about using a PP O-Power?

There are a few things that will break a fishing chain:

• Reeling in too fast/slow
• Getting the 'Nothing Seems to be biting' message
• Moving, (even slightly bumping the analog/circle pad)

Things that won't break your chain:

• Defeating, catching or running from Pokemon
• Changing rod
• Reeling in a different Pokémon
• Using the menu
• Using items & interacting with Party Pokemon

Things that help:

• A Pokemon with the Ability Suction Cups in your first party slot will increase the chances of reeling in a fish.
• Fishing in spots enclosed by rocks/cliff/deep water decreases the chance of not reeling in fish

Sources:

• Smogon
• GameFAQs
• IGN Boards
• Serebii